what film was it? i paid around $300 to get 3M film all around (except front) on my 540. also see if you can look at examples of their work. nothing uglier than a botched tint job... i got mine done at top of the line tint in lodi, nj (http://www.topofthelinetint.com/auto_01.html) recommended

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'90 E30 M3
'05 X5/3.0 Sport (E53)
'03 540i/6 M-Sport (E39)
'91 325i/5 Sport Package (E30)
BMWCCA #360858 SCCA# 374179